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Why back flow at the outlet???

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Old   February 9, 2011, 06:07
Smile Why back flow at the outlet???
Join Date: Sep 2010
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Hi to every one,

I am trying to simulate the diesel flow in the nozzle of the injector. At the outlet of the nozzle i am getting the back flow. I have used the following boundary condition for velocity and pressure.

0/p file

type totalPressure;
U U;
phi phi;
rho none;
psi none;
gamma 1;
p0 uniform 1100000;
value uniform 1100000;
type fixedMeanValue;
meanValue 100000;



0/U file

type zeroGradient;
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);

So could you please tell me the reason why there is back flow at the outlet of the nozzle.???

Thanks in advance.
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